Steering mirror platforms provide precise motion
A
PI (Physik Instrumente) product story
Edited by the Engineeringtalk editorial team
Dec 20, 2007
Parallel-kinematics design provides symmetrical dynamic performance in both axes with faster response and better linearity in a smaller package.
PI has extended its S-330 high-dynamics piezo tip/tilt platform family with several new large-angle models.
There are six closed- and open-loop models for mirrors up to 50mm diameter, featuring optical beam deflection to 20mrad.
A resonant frequency above 3kHz provides submillisecond step response, and resolution to 20nrad ensures excellent position stability.
The platforms feature a parallel-kinematics design for higher dynamics, stability and linearity, with closed-loop versions available for even better linearity.
Differential drives provide excellent temperature stability.
Typical applications for the S-330 family include: beam correction, laser surgery, image stabilisation, interlacing, dithering, laser scanning and beam steering, optical communications, and high resolution microscopy and spectroscopy.
S-330 steering mirror platforms provide precise angular tip/tilt motion of the top platform around two orthogonal axes.
These flexure-guided, piezoelectrically driven systems can provide higher accelerations than other actuators, enabling step response times in the submillisecond range.
The single pivot-point design also prevents the drawback of polarisation rotation, which is common with conventional two-axis stacked systems, such as galvo scanners.
PI piezo steering mirrors are based on a parallel-kinematics design with coplanar rotational axes and a single moving platform driven by two pairs of differential actuators.
The advantage is jitter-free, multi-axis motion with excellent temperature stability.
Compared with stacked (two-stage), mirror scanners, the parallel-kinematics design provides symmetrical dynamic performance in both axes with faster response and better linearity in a smaller package.
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